Not the person you replied, but no.
It’s more of a proficiency issue than anything else. Bad healers makes bad decisions no matter how well/badly designed the job is.
I.e. Medica II as their first line of defense in lv90 content; not reading their tooltip; misjudging the amount of health required to survive next raidwide; simply choosing not to dps when nothing’s happening; simply forgetting to heal; or for whatever reason chooses not to heal.
The list goes on.